Filter Lands!

I'm looking for any good Bant lands. I need a treva's lair, and I need a G/W filter land, g/w pain land, and any other cheap ones would be nice. My deck needs mana fixing. Also looking for hints and tips to see how to beef it up a little more if it's cheap. I would love shock and search land, but they are way out of my price point, lol. it runs okay for now, I would just like to beef it.